Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 50

Installation sequence
Hydraulically connecting the primary/secondary...
Connecting the secondary circuit
1. Equip the secondary circuit on site
with an expansion vessel and safety
assembly (in accordance with
DIN 4757).
Fit the safety assembly to the on-site
line in the heating water return.
2. Connect secondary lines to the heat
pump (7 ≥ 42 mm).
!
Please note
To prevent damage to the
appliance, connect the secon-
dary lines to the heat pump
free of load and torque
stresses.
The secondary lines must not
exert any pressure onto the
heat pump casing.
!
Please note
Ensure the hydraulic connec-
tions on the secondary side
are tight in order to prevent
the formation of condensate
inside the heat pump.
■ With line entries, ensure the
diaphragm grommets on
the l.h. side panel are
seated correctly.
■ Make line entries air-tight.
50
3. Fill and vent secondary circuit.
4. Thermally insulate pipes inside the
building.
Note
■ In underfloor heating circuits, install a
temperature limiter on site to restrict
the maximum temperature of under-
floor heating systems.
■ Safeguard minimum flow rate, e.g.
with overflow valve (see specification,
page 142).
(cont.)